Process and apparatus for spinning artificial silk on bobbins



@cfi 1934- H. G. VAN DER WAALS 1,976,272

PROCESS AND APPARATUS FOR SPINNING ARTIFICIAL SILK ON BOBBINS Filed Jan.22. 1934 fidriK G.Van D r Waals INVENTOR ATTORNEY Patented Oct. 9, 1934UNITED STATES PATENT OFFICE PROCESS AND APPARATUS FOR SPINNINGARTIFICIAL SILK N BOBBINS Application January 22, 1934, Serial No.707,791 In Germany March 16, 1933 Claims.

This invention relates to bobbin spinning wherein a novel method andapparatus is provided therefor. It is more particularly applicable totwo of the general types of ordinary bobbin spinning machines whichinclude What is known as the single spinning machine and the doublespinning machine.

The single spinning machine consists of a series of spinning heads, eachspinning head including one spinnerette and two bobbins. In operationthe filaments are extruded from the spinnerettes and-spun onto everyother bobbin, the alternate bobbins in the series remaining stationaryduring the spinning period. Upon the completion of the spinning, thefilaments from the spinnerettes are transferred to the alternate bobbinsand a second spinning takes place while the full bobbins are beingdofied.

In the double spinning machine a plurality of spinning heads is alsoemployed, but in this case a spinnerette is provided for each bobbin inthe series. When the spinning operation has been completed the filamentsfrom a number of spinnerettes are transferred to one empty bobbin orwaste roller and are spun in this manner during the dofing period of thefull bobbins. The filaments being spun on the bobbin or waste rollerduring this stage cannot be utilized. Upon completion of the doffing,empty bobbins are placed on the spindles and the same operation againtakes place.

Both of the above described processes present the disadvantage ofspinning the filaments under tension and therefore a compact packageresults. This causes two very troublesome problems to arise. First,owing to the tightness of the wound mass it is very difficult to subjectthe package to after treating steps, which include washing,desulphurizing, bleaching, dying, etc. Second, because of the rigidityof the bobbin the inner layers of filaments cannot shrink in the samemanner as the outer layers thereby resulting in uneven shrinkage whichfinally results in an uneven dying throughout the package.

The present invention has for its object to provide a method ofsimultaneously rewinding one set of previously spun bobbins undersubstantially no tension while spinning an alternate set of bobbins.

A further object is the provision of an apparatus to successfully carryout the rewinding step in conjunction with the spinning step.

The invention can more clearly be described by referring to the drawingwherein similar reference characters represent like parts.

Fig. l is a diagrammatic front view of the apparatus, wherein the firststage of the spinning and rewinding operations is shown.

Fig. 2 is similar to Fig. 1 except that the spinning operation has beensubstantially completed, and the rewinding operation has been fullycompleted; and

Fig. 3 is also similar to Fig. 1 showing the new position of thefilaments in the second spinning and rewinding operations.

Whereas any number of spinning heads may be employed, for the purpose ofdescribing the invention only a part of a single spinning machine isshown in the figures including one complete spinning head and a portionof two spinning heads and may be placed close enough to the bobbin 3a sothat a thread guide is unnecessary during the rewinding operation.

As shown in Fig. l the first spinning of the filaments 1 and 1a takesplace on bobbins 2 and 2a respectively. As stated, the number of bobbinsto be employed is optional and this much of the process is similar tothat performed on the ordinary single spinning machine wherein thefilaments from each spinnerette are wound on every other bobbin of aseries.

In place of allowing the alternate bobbins 3 and 3a to remain idle, theyare used to rewind previously spun bobbins. In order to effect this anadditional loose running bobbin holder 4 is provided for each pair ofbobbins. The bobbin holder 4 may be placed in any convenient posi tionnear the driven bobbin. One location, as shown in the drawing, is belowand between each pair of driven bobbins designated at 4, 4a and 422.While the filament 1 is being spun on bobbin 2, a rewinding is takingplace from a previously spun bobbin 5 placed on the loose running bobbinholder 4, onto a bobbin 3a.

Fig. 2 shows that stage of the operation where the spinning of thefilament 1 onto the bobbin 2 has been substantially completed and therewinding from the bobbin 5 onto the bobbin 3c has been entirelycompleted.

Fig. 3 exemplifies the next step in the operation wherein the first setof bobbins 2 and 2a have been spun and transferred to the bobbin holders4 and 4a and the alternate bobbins 3 and 3a have been rewound andremoved for further treatment. have been transferred to the bobbinholders from which the bobbins 3 and 3a have been removed, and thefilaments l and 1a have been transferred to these bobbins 3 and 3a. Thecompleted bobbins 2 and 2a have been transferred to the loose The now.empty bobbins 4 and 40.

running bobbin holders 4 and 4a. These bobbins are rewound on emptybobbins in positions 2 and 2a. Thus the simultaneous spinning andrewinding operations again take place as previously described.

Owing to the fact that the bobbins are rewound from loose runningspindles, a loosely wound mass is formed which tends to make anexcellent package for after treatment. Another advantage is that thepreviously innermost layers of filaments which could not contractbecause or" the rigidity of the bobbin holders are now the outermostlayers and can shrink normally.

The bobbins which are being first spun from the spinnerettes areconidized, which decreases their speed of rotation towards thecompletion of the package, while the alternate bobbins are being rewoundand driven at approximately the initial speed of rotation of the firstspun bobbins. Therefore the rewinding of the package is completed beforethe spinning operation is finished. In this manner the rewound bobbinsmay be doifed and empty bobbins replaced during the completion of thespinning stage.

Whereas the invention has been described as applied to the singlespinning machine it may, if desired, be employed with the doublespinning machine in whichcase it will be necessary to add a secondpositively driven bobbin and a loose running bobbin holder for everyspinning head.

It is not meant that the invention be interpreted as applied to thedrawing, as various modifications may be made to fall within the scopeof the invention.

Having thus described my invention, what I claim is:

1. In a process for the manufacture of artificial silk on spinningmachines which contain two series of driven bobbins in alternaterelationship, in which the bobbins of one series are normally idleduring the spinning period, the step which comprises utilizing theseries of normally idle bobbins by rewinding filaments thereonsimultaneously with the spinning of freshly extruded filaments on theother series of bobbins.

2. A process according to claim 1 in which the rewinding operation isterminated prior to the completion of the spinning operation whereby therewound bobbins may be replaced by empty bobbins before the doffing ofthe freshly spun bobbins.

3. In a process for the manufacture of artificial silk on spinningmachines which contain a series of freely rotatable bobbins and twoseries of driven bobbins in alternate relationship, in which the bobbinsof one series are normally idle during the spinning period, the stepswhich comprise, utilizing the series of normally idle bobbins byrewinding filaments thereon from the series of freely rotatable bobbins,simultaneously spinning freshly extruded filaments on the other seriesof bobbins, terminating the rewinding operation prior to the completionof the spinning step, removing the rewound bobbins and replacingtherefor empty bobbins, transferring the freshly spun bobbins to thefreely rotatable bobbin holders and repeating the above cycle.

4. An apparatus for the manufacture of artificial silk comprising incombination two series of driven bobbins in alternate relationship inwhich the bobbins of one series are normally allowed to remain idleduring the spinning period, a series of loose running bobbin holders,means for spinning on one of the said series of bobbins and means forutilizing the other of the said series of bobbins which are normallyallowed to remain idle, by simultaneously rewinding thereon filamentsfrom previously spun bobbins located on the series of loose runningbobbin holders.

5. An apparatus as defined in claim 4 which includes means forterminating the said rewinding operation prior to the spinning stepwhereby the rewound bobbins may be replaced by empty bobbins before thedofiing of the freshly spun bobbins.

HENDRIK GERARDUS VAN DER WAALS.

